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SUBROUTINE sla_CALDJ (IY, IM, ID, DJM, J)
*+
* - - - - - -
* C A L D J
* - - - - - -
*
* Gregorian Calendar to Modified Julian Date
*
* (Includes century default feature: use sla_CLDJ for years
* before 100AD.)
*
* Given:
* IY,IM,ID int year, month, day in Gregorian calendar
*
* Returned:
* DJM dp modified Julian Date (JD-2400000.5) for 0 hrs
* J int status:
* 0 = OK
* 1 = bad year (MJD not computed)
* 2 = bad month (MJD not computed)
* 3 = bad day (MJD computed)
*
* Acceptable years are 00-49, interpreted as 2000-2049,
* 50-99, " " 1950-1999,
* 100 upwards, interpreted literally.
*
* Called: sla_CLDJ
*
* P.T.Wallace Starlink November 1985
*
* Copyright (C) 1995 Rutherford Appleton Laboratory
*-
IMPLICIT NONE
INTEGER IY,IM,ID
DOUBLE PRECISION DJM
INTEGER J
INTEGER NY
* Default century if appropriate
IF (IY.GE.0.AND.IY.LE.49) THEN
NY=IY+2000
ELSE IF (IY.GE.50.AND.IY.LE.99) THEN
NY=IY+1900
ELSE
NY=IY
END IF
* Modified Julian Date
CALL sla_CLDJ(NY,IM,ID,DJM,J)
END
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